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CVE-2025-40092— usb: gadget: f_ncm: Refactor bind path to use __free()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ncm_bind函数中未正确清理notify_req请求，可能导致空指针取消引用。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 9f6ce4240a2bf456402c15c06768059e5973f28c< 185193a4714aa9c78437a7a1858fbe5771f0f45c affected
9f6ce4240a2bf456402c15c06768059e5973f28c< f37de8dec6a4c379b4b8486003a1de00ff8cff3b affected
9f6ce4240a2bf456402c15c06768059e5973f28c< 1cde4516295a030cb8ab4c93114ca3b6c3c6a1e2 affected
9f6ce4240a2bf456402c15c06768059e5973f28c< d3fe7143928d8dfa2ec7bac9f906b48bc75b98ee affected
9f6ce4240a2bf456402c15c06768059e5973f28c< ed78f4d6079d872432b1ed54f155ef61965d3137 affected
9f6ce4240a2bf456402c15c06768059e5973f28c< 75a5b8d4ddd4eb6b16cb0b475d14ff4ae64295ef affected
2.6.38 affected
< 2.6.38 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-40092

Vulnerability Information
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Vulnerability Title
usb: gadget: f_ncm: Refactor bind path to use __free()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Refactor bind path to use __free() After an bind/unbind cycle, the ncm->notify_req is left stale. If a subsequent bind fails, the unified error label attempts to free this stale request, leading to a NULL pointer dereference when accessing ep->ops->free_request. Refactor the error handling in the bind path to use the __free() automatic cleanup mechanism. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 Call trace: usb_ep_free_request+0x2c/0xec ncm_bind+0x39c/0x3dc usb_add_function+0xcc/0x1f0 configfs_composite_bind+0x468/0x588 gadget_bind_driver+0x104/0x270 really_probe+0x190/0x374 __driver_probe_device+0xa0/0x12c driver_probe_device+0x3c/0x218 __device_attach_driver+0x14c/0x188 bus_for_each_drv+0x10c/0x168 __device_attach+0xfc/0x198 device_initial_probe+0x14/0x24 bus_probe_device+0x94/0x11c device_add+0x268/0x48c usb_add_gadget+0x198/0x28c dwc3_gadget_init+0x700/0x858 __dwc3_set_mode+0x3cc/0x664 process_scheduled_works+0x1d8/0x488 worker_thread+0x244/0x334 kthread+0x114/0x1bc ret_from_fork+0x10/0x20
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ncm_bind函数中未正确清理notify_req请求，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9f6ce4240a2bf456402c15c06768059e5973f28c ~ 185193a4714aa9c78437a7a1858fbe5771f0f45c -
Linux Linux 2.6.38 -

II. Public POCs for CVE-2025-40092

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III. Intelligence Information for CVE-2025-40092

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Patches & Fixes for CVE-2025-40092 (1)

Same Patch Batch · Linux · 2025-10-30 · 20 CVEs total

CVE-2025-40099 9.4 CRITICAL cifs: parse_dfs_referrals: prevent oob on malformed input
CVE-2025-40096 7.8 HIGH drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies
CVE-2025-40105 7.8 HIGH vfs: Don't leak disconnected dentries on umount
CVE-2025-40104 7.8 HIGH ixgbevf: fix mailbox API compatibility by negotiating supported features
CVE-2025-40095 7.8 HIGH usb: gadget: f_rndis: Refactor bind path to use __free()
CVE-2025-40094 7.8 HIGH usb: gadget: f_acm: Refactor bind path to use __free()
CVE-2025-40093 7.8 HIGH usb: gadget: f_ecm: Refactor bind path to use __free()
CVE-2025-40090 7.5 HIGH ksmbd: fix recursive locking in RPC handle list access
CVE-2025-40087 7.5 HIGH NFSD: Define a proc_layoutcommit for the FlexFiles layout type
CVE-2025-40088 7.1 HIGH hfsplus: fix slab-out-of-bounds read in hfsplus_strcasecmp()
CVE-2025-40091 ixgbe: fix too early devlink_free() in ixgbe_remove()
CVE-2025-40086 drm/xe: Don't allow evicting of BOs in same VM in array of VM binds
CVE-2025-40097 ALSA: hda: Fix missing pointer check in hda_component_manager_init function
CVE-2025-40098 ALSA: hda: cs35l41: Fix NULL pointer dereference in cs35l41_get_acpi_mute_state()
CVE-2025-40089 cxl/features: Add check for no entries in cxl_feature_info
CVE-2025-40101 btrfs: fix memory leaks when rejecting a non SINGLE data profile without an RST
CVE-2025-40100 btrfs: do not assert we found block group item when creating free space tree
CVE-2025-40102 KVM: arm64: Prevent access to vCPU events before init
CVE-2025-40103 smb: client: Fix refcount leak for cifs_sb_tlink

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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